Note: I gave the base game a five star review, seminal hit that it was, and obviously as a whole this game is worth five stars because it contains the entire base game. But I'm giving this score simply as a review of the additional chapter (Thy Flesh Consumed).

Doom is fantastic but is only as good as its levels, and while the levels in the expansion are very interesting and experimental, they also feel unpolished and rather ill-suited to the engine. Having plenty of vertically-oriented sections without vertical mouselook capability, and platforming sections without the ability to jump smacks of artificial difficulty. But perhaps the thing that most detracts from the experience is the paucity of health packs. Take a game that's miserly with its health bonuses in which you can save anywhere, and you end up incentivizing save-scumming.

It definitely had its moments, but was noticeably weaker as an experience than the original Doom.